Add boundaries à la NaturalEarth tiles

schema/create_schema.sh

@@ -18,6 +18,7 @@ function main() {
     exec_psql_file "$VT_UTIL_DIR/postgis-vt-util.sql"
     exec_psql_file "layers/water.sql"
     exec_psql_file "layers/building.sql"
+    exec_psql_file "layers/boundary.sql"
 }
 
 main

schema/layers/boundary.sql

@@ -0,0 +1,60 @@
+CREATE OR REPLACE FUNCTION boundary_class(featureclass VARCHAR) RETURNS VARCHAR
+AS $$
+BEGIN
+    RETURN CASE
+        WHEN featureclass ILIKE 'line of control%' THEN 'control'
+        WHEN featureclass ILIKE 'disputed%' THEN 'dispute'
+        WHEN featureclass ILIKE 'lease%' THEN 'lease'
+        WHEN featureclass ILIKE 'overlay%' THEN 'overlay'
+        ELSE 'boundary'
+    END;
+END;
+$$ LANGUAGE plpgsql IMMUTABLE;
+
+CREATE OR REPLACE VIEW boundary_z0 AS (
+    SELECT geom, 0 AS admin_level, scalerank,
+           boundary_class(featurecla) AS class
+    FROM ne_110m_admin_0_boundary_lines_land
+);
+
+CREATE OR REPLACE VIEW boundary_z1 AS (
+    SELECT geom, 0 AS admin_level, scalerank,
+           boundary_class(featurecla) AS class
+    FROM ne_50m_admin_0_boundary_lines_land
+    UNION ALL
+    SELECT geom, 1 AS admin_level, scalerank,
+           boundary_class(featurecla) AS class
+    FROM ne_50m_admin_1_states_provinces_lines
+    WHERE scalerank <= 2
+);
+
+CREATE OR REPLACE VIEW boundary_z3 AS (
+    SELECT geom, 0 AS admin_level, scalerank,
+           boundary_class(featurecla) AS class
+    FROM ne_50m_admin_0_boundary_lines_land
+    UNION ALL
+    SELECT geom, 1 AS admin_level, scalerank,
+           boundary_class(featurecla) AS class
+    FROM ne_50m_admin_1_states_provinces_lines
+);
+
+CREATE OR REPLACE VIEW boundary_z5 AS (
+    SELECT geom, 0 AS admin_level, scalerank,
+           boundary_class(featurecla) AS class
+    FROM ne_10m_admin_0_boundary_lines_land
+    UNION ALL
+    SELECT geom, 1 AS admin_level, scalerank,
+           boundary_class(featurecla) AS class
+    FROM ne_10m_admin_1_states_provinces_lines_shp
+    WHERE scalerank <= 7
+);
+
+CREATE OR REPLACE VIEW boundary_z7 AS (
+    SELECT geom, 0 AS admin_level, scalerank,
+           boundary_class(featurecla) AS class
+    FROM ne_10m_admin_0_boundary_lines_land
+    UNION ALL
+    SELECT geom, 1 AS admin_level, scalerank,
+           boundary_class(featurecla) AS class
+    FROM ne_10m_admin_1_states_provinces_lines_shp
+);